Gate-valve



N0. 608,68I. Patented Aug. 9, I898.

- A. L. HYDE.

GATE VALVE.

(Application filed Sept. 27, 1897.)

(No Modek.)

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ALFRED LEwis HYDE, on NEWARK, NEW JERSEY.

GATE-VALVE.

SPECIFICATION forming part of Letters Patent No. 608,681, dated August 9, 1898. Application filed September 27, 1897. Serial No. 653,211. (No model.)

To (tZZ whom it may concern.-

Be it known that I, ALFRED LEWIS HYDE, a citizen of the United States, residing at Newark, in the county of Essexand State of New Jersey, have invented certain new and useful Improvements in Gate-Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has reference to anovel construction of gate-valve, and more especially to mechanism for opening and closing the valve, the object being to provide simple and convenient mechanism by means of which the valve may be quickly opened and closed, to insure the closing of the valve, and to protect the screw-rod for operating the valve from the corrosive effects of the medium that may pass through the valve-chamber.

The invention consists in the novel features of construction hereinafter more fully described, and particularlypointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a vertical longitudinal section of a gate constructed in accordance with this invention. Fig. 2 is aperspective view of part of one of the valves. Fig. 3 is a perspective view of the wedge. Fig. i is a perspective view of the coupling for connecting the valves with the valvestem.

Referring now to said drawings, 1 indicates the valve-casin g, that is of ordinary construction, having the oppositely-situated valveseats 2 and the valves 3 to rest upon said seats, said parts being faced in the usual manner to produce tight joints. In the bottom of the valve-casin g and between the valve-seats 2 is an uprising stud or projection 4:, hereinafter referred to. The valve-stem 5 is connected at its lower end with the valves 3 and extends upwardly through the top of the valve-casing, the tight joint being secured by means of the stuffing-box 6, as is obvious. This valve-stem 5.is hollow and is screw-threaded interiorly to receive the lower screw-threaded portion of the screw-shaft 7 for operating the valve-stein. In this way it is seen that the screw-shaft 7 is entirely protected from the medium that may pass through the valvecasing, since it isentirely inelosed by the hollow valve-ste1n,which extends through the stufiingbox, as shown. The said screw-shaft 7 passes upwardly and through the guide 8, that extends between the uprights 9, the openin g through said guide being babbitted to prevent wear, while said guides serve to hold the screw-shaft in perfect alinement. Upon the heads of the uprights 9 is secured a nut 10, that is stationary and through which the up per end portion of the screw-shaft 7 passes. The said screw-shaft is provided with a longitudinal groove 11, that extends about halfway and receives a key 12, carried by the bushing 13, that is held above the nut by the sleeve 14, that is also rigidly secured upon said uprights, and upon which rests the hand wheel 15,that is rigid with the said bushing 13.

The oppo'siteend portions of the screwshaft 7 are provided with I a-right and left hand screw, and it will be seen from the foregoing description that when the handwheel 15 isturned the said screw-shaft 7 is turned, and by reason of the stationary nut 10 said screw-shaft rises, while by reason of the screw-threaded connection between the lower end portions of the screw-shaft and the valve-stem 5 this valve-stem is not only raised by reason of its connection with the screwshaft, but also rises at twice the speed of the screw shaft, owing to the screw threaded connection above referred to.

The coupling 16 for connecting the valvestem 5 with the valves 3 is provided with a central aperture 17 to receive the lower end of the valve-stem, while on opposite sides it is provided with depending flanges 18, pro vided with the depressions 19 at their lower ends and midway between the sides thereof. The upper end of the coupling 16 is provided with uprisinglateral flanges 20 and with a central web 21, extending between the said flanges 20 and the boss at the centerof the coupling, it being noted that the upper edge of the web 21 is a little below the top flange 20. The valves 3 are similar in construction,

and each consists of a circular body portion faced on the outside, as shown, while the inner face of the valve is providednear its upper end with an overhanging hook 22, having the depending lugs 23, .while just below the said hook 22 is a ledge 24, with a central projection 25 midway between the ends and at the rear side of the same. The side of the coupling 16 is adapted to enter between the hook and the ledge 24 in the manner shown, it being noted that the lugs 23 stand on opposite sides of the web 21, while the lower flange 19 of the coupling rests upon the ledge 24:, with the projection 25 situated within the socket 19. Just below the ledge 24 is a curved bearing face or socket 26, on the sides of which are the outwardly-extending plates 27, and below the lower ends of this bearing-face 26 is an outwardly-extending ledge 28. Below the ledge 28 are the outwardly-eXtendin g upright guide-plates 29. A wedge 30 is provided with a tapering head 31, having the downwardly-facing shoulders 32 and the reduced and depending stem On the sides of the stem and extending outwardly from the shoulders 32 are the pins 34. This wedge is inserted between the valves, with its downwardly-facing shoulders 32 resting upon the ledge 28 of the valve and with the pins 34 situated between the guide-plates 29 of said valves. VVedge-blocks 35, having curved outer faces and straight inner faces, are situated between the tapering head of the wedge 31 and the curved bearing-faces 26 of the valves, it being noted that the wedgeblocks adjust themselves automatically to the different positions the parts may assume.

It is seen from the foregoing description that when the valves are raised the Wedge 31 is suspended and allows the valves to move toward each other a little distance, while in descending the lower end of the stem 33 of the wedge comes in contact with the stud or projection 4: of the valve-casing, while the continued downward movement of the valve throws the same outwardly and against the valve-seats by reason of the wedging action between the tapering head of the wedge 31, the wedge-block 85, and said valve, so that the valves are forced against their seats under considerable pressure to insure the closing thereof.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with a valve, of a hollow stem operativel y connected therewith and provided with internal screw-threads, a rod fitting within said stem provided with oppositely-screw-threaded ends and with a longitudinal groove, a stationary nut through the longitudinally-movable valve-stem provided at its lower end with a coupling having upwardly and downwardly extending lateral flanges, inwardly-extending webs at the upper end of said coupling, sockets in the outer faces of said downwardly-extending flanges, overhanging hooks upon the rear faces of said valves provided with downwardly-extending lugs to embrace said webs of the coupling, and an upwardly-facing ledge or projection upon each of the valves to receive the laterally-depending flanges of said coupling, substantially as described.

3. The combination with the oppositelyfacing valve-seats,of oppositely-facing valves connected with a longitudinally movable valve-stem, a curved bearing-face on the rear side of each of said valves, guide-plates on opposite sides of said bearing-faces, an upwardly-faein g ledge below said bearing-faces, guide-plates below said ledge, a wedge havin ga tapered head, downwardly-facing shoulders to rest upon the ledge of the valves, a depending stem provided with lateral fins to be guided by said guide-plates, wedge-blocks between said tapered head and the bearingfaces of the valves, and a projection upon the valve-casing to encounter the lower end of said stem as the valve approaches the lower limit of its movement, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

ALFRED LEWIS HYDE.

WVitnesses:

WALLACE SULLIVAN, S. PERIT RAWLE. 

